How to start with Blender?
To elaborate on what gandalf3 commented, the answer is check out Blender: Noob to Pro here http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro

I suggest while you go through the tutorials you should freely test out any ideas you might have like "Hey what happens when I do this?", 
Also you may want to take a look and get familiar with Blender's shortcut keys.